Gallstones

Gallstones are hard deposits, or simply stones, that form inside the gallbladder. This condition is also known by the Greek name, cholelithiasis. "Chole" means bile, "lith" comes from the word lithos, meaning stone, and "-iasis" refers to an abnormal condition in the body. Put it all together, and cholelithiasis means having bile stones.

Now, picture yourself enjoying a creamy plate of Greek moussaka. As those fats move through your digestive system, they finally reach the small intestine. But fats are difficult to process, and that’s where the small, pear-shaped organ gallbladder steps in.

The gallbladder acts as a storage tank for bile produced by the liver. The liver carefully blends this digestive smoothie with just the right mix of bile salts, phospholipids, cholesterol, and bilirubin.

The liver starts the recipe by converting cholesterol into bile acids, such as cholic acid. Then it mixes these bile acids with amino acids like taurine to create water-soluble bile salts that flow smoothly into the bile.

But not all cholesterol takes this path. Some slip directly into bile as free cholesterol, where it mixes with bile salts and phospholipids like lecithin. These ingredients act like tiny detergents, wrapping around cholesterol molecules to keep them from crystallizing and clumping.

Another key ingredient in bile is bilirubin, which comes from the natural breakdown of red blood cells. When red blood cells reach the end of their life, they release hemoglobin, which is further broken down into heme and globin. The body converts heme into biliverdin and biliverdin to unconjugated bilirubin. However, unconjugated bilirubin isn’t water-soluble, so it binds to albumin to hitch a ride to the liver. In the liver, the body transforms unconjugated bilirubin into water-soluble conjugated bilirubin ready for excretion into bile.

The liver produces bile continuously, sending it either directly to the small intestine or to the gallbladder for storage. The gallbladder walls, which are lined and coated with protective mucus, absorb water and electrolytes, concentrating the bile up to ten times its original strength.

Most of the time, the liver blends this bile smoothie perfectly. But sometimes, things go off the recipe. The bile becomes too thick, or the gallbladder doesn’t empty as it should. That’s when gallstones form, and depending on their main ingredient, they can be cholesterol stones and pigmented stones.

Cholesterol stones are the most common ones, and they develop exclusively in the gallbladder for several reasons. The main one is supersaturation with cholesterol, which happens when the bile recipe is off. Basically, the liver adds too much free cholesterol but not enough bile salts and phospholipids. It’s like pouring too much protein powder into your smoothie. Instead of blending smoothly, it starts to clump together.

The second reason is gallbladder stasis, also known as gallbladder hypomotility, which means the gallbladder isn’t contracting the way it should. Just like a smoothie that sits out too long and starts to separate, a stagnant bile gives cholesterol molecules time to clump together.

Finally, the gallbladder can produce more mucus than it should. This thick layer creates the perfect environment to trap cholesterol crystals, allowing them to clump together. It’s like adding too much syrup to your smoothie.